DevTools: Extract CSS resources preloading from css agent to page agent controlled loader.

Source/core/inspector/InspectorResourceContentLoader.h

Index: Source/core/inspector/InspectorResourceContentLoader.h
diff --git a/Source/core/inspector/InspectorResourceContentLoader.h b/Source/core/inspector/InspectorResourceContentLoader.h
new file mode 100644
index 0000000000000000000000000000000000000000..c781e20d032bd748b5bf527e5e99b93c7f9ede9b
--- /dev/null
+++ b/Source/core/inspector/InspectorResourceContentLoader.h
@@ -0,0 +1,47 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef InspectorResourceContentLoader_h
+#define InspectorResourceContentLoader_h
+
+#include "core/fetch/ResourcePtr.h"
+#include "wtf/HashSet.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/Vector.h"
+
+namespace WebCore {
+
+class CSSStyleSheetResource;
+class Page;
+class Resource;
+class VoidCallback;
+
+class InspectorResourceContentLoader FINAL {
+    WTF_MAKE_NONCOPYABLE(InspectorResourceContentLoader);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    InspectorResourceContentLoader(Page*);
+    void addListener(PassOwnPtr<VoidCallback>);
+    ~InspectorResourceContentLoader();
+    bool hasFinished();
+    void stop();
+
+private:
+    class ResourceClient;
+
+    void resourceFinished(ResourceClient*);
+    void checkDone();
+
+    Vector<OwnPtr<VoidCallback> > m_callbacks;
+    bool m_allRequestsStarted;
+    HashSet<ResourceClient*> m_pendingResourceClients;
+    Vector<ResourcePtr<Resource> > m_resources;
+
+    friend class ResourceClient;
+};
+
+} // namespace WebCore
+
+
+#endif // !defined(InspectorResourceContentLoader_h)